P. dubium can retain the radio of seed germination more than 60% at -1.0Mpa, showing it has strong drought resistance, erratically drought stress is the primary reason;

• 巴西盾柱木种子能够在-1.；0MPa下保持60%25以上的萌发率；显示出其具有很强的抗旱能力；不规律的干旱胁迫并非巴西盾柱木种群濒危的主要原因;